Chapter 5: Vertebrates.

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2 Vertebrates Animals with backbonesAll vertebrates have an endoskeleton, an internal support system that makes the animal more flexible and easier to move.The 5 groups are birds, fish, amphibians, reptiles, and mammals.

3 FishHave gills, a respiratory organ that filters oxygen dissolved in water.Have sensory organs for taste, odor, and sound.Female fish lay eggs that are fertilized by a certain male. Eggs develop and hatch on their own

4 Amphibians Lay eggs in water Smooth, moist skinSkin works as a respiratory organ only when wet.Can live in moist land environments as adults.Ex: Frogs, toads, salamanders

5 Reptiles Tough, dry skin covered by scalesObtain oxygen from air with lungsLay eggs, which have shells, on land.Ex: snakes, lizards, alligators

6 EctothermsAmphibians and reptiles are ectotherms, animals whose body temperatures changes with environmental conditions.For example, on a cool day, a tortoise’s body will be cooler than it is on a hot one.

7 Birds Have feathers and beaksHave a pair of scaly legs and a pair of wingsTheir eggs have hard shells.Mothers sit on their eggs to keep them warm (incubation)Hollow bones